/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.iotdb.db.mpp.common.schematree.node;

import org.apache.iotdb.tsfile.utils.ReadWriteIOUtils;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.HashMap;
import java.util.Map;

public class SchemaEntityNode extends SchemaInternalNode {

    private boolean isAligned;

    private Map<String, SchemaMeasurementNode> aliasChildren;

    public SchemaEntityNode(String name) {
        super(name);
    }

    @Override
    public SchemaNode getChild(String name) {
        SchemaNode node = super.getChild(name);
        if (node != null) {
            return node;
        }
        return aliasChildren == null ? null : aliasChildren.get(name);
    }

    public void addAliasChild(String alias, SchemaMeasurementNode measurementNode) {
        if (aliasChildren == null) {
            aliasChildren = new HashMap<>();
        }
        aliasChildren.put(alias, measurementNode);
    }

    public boolean isAligned() {
        return isAligned;
    }

    public void setAligned(boolean aligned) {
        isAligned = aligned;
    }

    @Override
    public void replaceChild(String name, SchemaNode newChild) {
        super.replaceChild(name, newChild);
        if (newChild.isMeasurement()) {
            SchemaMeasurementNode measurementNode = newChild.getAsMeasurementNode();
            if (measurementNode.getAlias() != null) {
                aliasChildren.replace(name, measurementNode);
            }
        }
    }

    @Override
    public void copyDataTo(SchemaNode schemaNode) {
        if (!schemaNode.isEntity()) {
            return;
        }
        SchemaEntityNode entityNode = schemaNode.getAsEntityNode();
        entityNode.setAligned(isAligned);
        if (aliasChildren != null) {
            for (SchemaMeasurementNode child : aliasChildren.values()) {
                entityNode.addAliasChild(child.getAlias(), child);
            }
        }
    }

    @Override
    public boolean isEntity() {
        return true;
    }

    @Override
    public SchemaEntityNode getAsEntityNode() {
        return this;
    }

    @Override
    public byte getType() {
        return SCHEMA_ENTITY_NODE;
    }

    @Override
    public void serialize(OutputStream outputStream) throws IOException {
        serializeChildren(outputStream);

        ReadWriteIOUtils.write(getType(), outputStream);
        ReadWriteIOUtils.write(name, outputStream);
        ReadWriteIOUtils.write(isAligned, outputStream);
        ReadWriteIOUtils.write(children.size(), outputStream);
    }

    public static SchemaEntityNode deserialize(InputStream inputStream) throws IOException {
        String name = ReadWriteIOUtils.readString(inputStream);
        boolean isAligned = ReadWriteIOUtils.readBool(inputStream);

        SchemaEntityNode entityNode = new SchemaEntityNode(name);
        entityNode.setAligned(isAligned);
        return entityNode;
    }
}
